Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)
-
Published:2020-02-21
Issue:4
Volume:17
Page:917-943
-
ISSN:1726-4189
-
Container-title:Biogeosciences
-
language:en
-
Short-container-title:Biogeosciences
Author:
Tonnard Manon, Planquette Hélène, Bowie Andrew R.ORCID, van der Merwe PierORCID, Gallinari Morgane, Desprez de Gésincourt Floriane, Germain Yoan, Gourain ArthurORCID, Benetti Marion, Reverdin GillesORCID, Tréguer Paul, Boutorh Julia, Cheize Marie, Lacan FrançoisORCID, Menzel Barraqueta Jan-LukasORCID, Pereira-Contreira Leonardo, Shelley RachelORCID, Lherminier PascaleORCID, Sarthou Géraldine
Abstract
Abstract. Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analyzed using a
seaFAST-pico™ coupled to an Element XR sector field
inductively coupled plasma mass spectrometer (SF-ICP-MS) and provided interesting
insights into the Fe sources in this area. Overall, DFe concentrations ranged
from 0.09±0.01 to 7.8±0.5 nmol L−1.
Elevated DFe concentrations were observed above the Iberian, Greenland, and
Newfoundland margins likely due to riverine inputs from the Tagus River,
meteoric water inputs, and sedimentary inputs. Deep winter convection
occurring the previous winter provided iron-to-nitrate ratios sufficient to
sustain phytoplankton growth and lead to relatively elevated DFe
concentrations within subsurface waters of the Irminger Sea. Increasing DFe
concentrations along the flow path of the Labrador Sea Water were attributed
to sedimentary inputs from the Newfoundland Margin. Bottom waters from the
Irminger Sea displayed high DFe concentrations likely due to the dissolution
of Fe-rich particles in the Denmark Strait Overflow Water and the Polar
Intermediate Water. Finally, the nepheloid layers located in the different
basins and at the Iberian Margin were found to act as either a source or a
sink of DFe depending on the nature of particles, with organic particles
likely releasing DFe and Mn particle scavenging DFe.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference147 articles.
1. Achterberg, E. P., Steigenberger, S., Marsay, C. M., LeMoigne, F. A.,
Painter, S. C., Baker, A. R., Connelly, D. P., Moore, C. M., Tagliabue, A.,
and Tanhua, T.: Iron Biogeochemistry in the High Latitude North Atlantic
Ocean, Sci. Rep., 8, 1–15, https://doi.org/10.1038/s41598-018-19472-1, 2018. 2. Aminot, A., and Kerouel, R.: Dosage automatique des nutriments dans les eaux
marines, Edn. Quae, 191 pp., 2007. 3. Annett, A. L., Skiba, M., Henley, S. F., Venables, H. J., Meredith, M. P.,
Statham, P. J., and Ganeshram, R. S.: Comparative roles of upwelling and
glacial iron sources in Ryder Bay, coastal western Antarctic Peninsula,
Mar. Chem., 176, 21–33, https://doi.org/10.1016/j.marchem.2015.06.017, 2015. 4. Armi, L., Hebert, D., Oakey, N., Price, J., Richardson, P. L., Rossby, T.,
and Ruddick, B.: The history and decay of a Mediterranean salt lens, Nature,
333, 649–651, https://doi.org/10.1038/333649a0, 1988. 5. Bacon, S., Gould, W. J., and Jia, Y.: Open-ocean convection in the Irminger
Sea, Geophys. Res. Lett., 30, 1246, https://doi.org/10.1029/2002GL016271, 2003.
Cited by
24 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|